LabVIEW Add-On VIs Appear as Question Marks

Updated Apr 5, 2023

Reported In


  • LabVIEW Full
  • LabVIEW Base
  • LabVIEW Professional
  • JKI VI Package Manager
  • Third Party Add-Ons

Issue Details

  • I have third-party add-ons installed, but the VIs in LabVIEW show up as question marks.
  • I updated LabVIEW versions and when I open my project in the new version of LabVIEW, the third-party LabVIEW Add-On VIs are broken and showing up as question marks.


Many LabVIEW Add-ons and libraries are distributed using the VI Package Manager . In order to use VIs for the LabVIEW Add-on in a newly downloaded version of LabVIEW, follow these steps:
  1. Completely close out of the version of LabVIEW that is displaying the question marks for VIs.
  2. Open VI Package Manager. If this is your first time opening VI Package Manager, it may take a while to load packages from the LabVIEW Tools Network.
  3. Use the Search to find the LabVIEW Add-on that you are missing in your current LabVIEW installation.

  4. Select the Toolkit or Add-on to highlight it.
  5. In the top toolbar, ensure that the version of LabVIEW selected is the version of LabVIEW that the VIs appear as question marks. Select the Install Package(s) button.

  6. The download may display a Licensing and Agreements page, depending on the package you are installing. It may also prompt you to restart LabVIEW.

Additional Information

Add-ons and Toolkits distributed through the VI Package Manager must be installed through the VI Package Manager for each version of LabVIEW you would like to work with the Add-on in. If you copy the VIs to the LabVIEW VI library from another LabVIEW version, you can potentially run into licensing issues. In this case, you may receive the message that the library is improperly licensed. 

If you are missing driver VIs or other palettes, you can follow the steps at this KnowledgeBase article titled: Missing Icons on Function or Control Palette